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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: 1991 ranger brake problem - CO2 & O3
Date: Fri, 15 Nov 2024 08:20:20 -0500
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"Clare Snyder"  wrote in message 
news:vcadjjta7qb14jlee2r76lk1394hrvncji@4ax.com...

The carbonyl [C=O] end groups which are formed are usually aldehydes or
ketones, which can oxidise further to carboxylic acids. The net result
is a high concentration of elemental oxygen on the crack surfaces,
which can be detected using energy-dispersive X-ray spectroscopy in
the environmental SEM, or ESEM. The spectrum at left shows the high
oxygen peak compared with a constant sulfur peak.
---------------------------------
That's slightly wrong like much of Wiki. Aldehyde implies an oxygen at the 
end but a ketone has oxygen hanging off in the middle. Chemistry is too 
complex for simple explanations. My 4 year degree in it qualified me only to 
understand further education which the Vietnam draft prevented, though the 
knowledge of matter, energy and quantum mechanics gave me a boost into other 
fields like semiconductor physics.

Sulfur is mixed into raw rubber to react with the C=C sites, but with 
different consequences, being less aggressive than its cousin oxygen it 
hardens and stabilizes, "vulcanizes", the rubber instead of enabling further 
degradation. It's the reason burning rubber smells bad.

Linseed and other "unsaturated" (double-bonded, -C=C-) plant-based oils 
cross-link and harden in air by a similar process. The fire hazard from a 
covered waste can of oily rags was caused by the feedback loop of oxidation 
releases heat and heat speeds further oxidation. The mineral oils that 
replaced them in machining have fewer double bonds and don't heat up. 
"Paraffin" is from Latin "parum affinitas" and means low reactivity.